tracing: provide trace_seq_reserve()
[linux-2.6.git] / kernel / trace / trace_output.h
1 #ifndef __TRACE_EVENTS_H
2 #define __TRACE_EVENTS_H
3
4 #include "trace.h"
5
6 typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
7                                               int flags);
8
9 struct trace_event {
10         struct hlist_node       node;
11         int                     type;
12         trace_print_func        trace;
13         trace_print_func        raw;
14         trace_print_func        hex;
15         trace_print_func        binary;
16 };
17
18 extern enum print_line_t
19 trace_print_bprintk_msg_only(struct trace_iterator *iter);
20 extern enum print_line_t
21 trace_print_printk_msg_only(struct trace_iterator *iter);
22
23 extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
24         __attribute__ ((format (printf, 2, 3)));
25 extern int
26 trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary);
27 extern int
28 seq_print_ip_sym(struct trace_seq *s, unsigned long ip,
29                 unsigned long sym_flags);
30 extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
31                                  size_t cnt);
32 int trace_seq_puts(struct trace_seq *s, const char *str);
33 int trace_seq_putc(struct trace_seq *s, unsigned char c);
34 int trace_seq_putmem(struct trace_seq *s, void *mem, size_t len);
35 int trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len);
36 void *trace_seq_reserve(struct trace_seq *s, size_t len);
37 int trace_seq_path(struct trace_seq *s, struct path *path);
38 int seq_print_userip_objs(const struct userstack_entry *entry,
39                           struct trace_seq *s, unsigned long sym_flags);
40 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
41                       unsigned long ip, unsigned long sym_flags);
42
43 int trace_print_context(struct trace_iterator *iter);
44 int trace_print_lat_context(struct trace_iterator *iter);
45
46 struct trace_event *ftrace_find_event(int type);
47 int register_ftrace_event(struct trace_event *event);
48 int unregister_ftrace_event(struct trace_event *event);
49
50 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags);
51
52 #define MAX_MEMHEX_BYTES        8
53 #define HEX_CHARS               (MAX_MEMHEX_BYTES*2 + 1)
54
55 #define SEQ_PUT_FIELD_RET(s, x)                         \
56 do {                                                    \
57         if (!trace_seq_putmem(s, &(x), sizeof(x)))      \
58                 return TRACE_TYPE_PARTIAL_LINE;         \
59 } while (0)
60
61 #define SEQ_PUT_HEX_FIELD_RET(s, x)                     \
62 do {                                                    \
63         BUILD_BUG_ON(sizeof(x) > MAX_MEMHEX_BYTES);     \
64         if (!trace_seq_putmem_hex(s, &(x), sizeof(x)))  \
65                 return TRACE_TYPE_PARTIAL_LINE;         \
66 } while (0)
67
68 #endif
69